Arrival and departure transportation indicator system



Dec. 1, 1953 I. MOLNAR ARRIVAL AND DEPARTURE TRANSPORTATION INDICATORSYSTEM Filed. Sept. 15, .1952

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Dec. 1, 1953 ARRIVAL AND Filed Sept. 13. 1952 MOLNAR 2,661,465

DEPARTURE TRANSPORTATION INDICATOR SYSTEM- 9 Sheets-Sheet 9 FIG. l2

PILOT SEECTOR MULTIPLE. T0 PILOT ITDICATOR SETS 2 TO l0 m m '3 IE E IPILOT NDICATOR SET w \ll '51 5E 0 2: 2 aHHHH lllllllli INVENTOR.

IMRE MOLNAR ATTY.

Patented Dec. 1, 1953 UNITED JPATENT OFFICE ARRIVAL AND DEPARTURE TRANSPORTA* TION INDICATOR SYSTEM rnrr e Molhar Chicaigo, 111., assignor'teAutomatic Eleotl ic Laboratories, 1110., Chicago, 111., "a corpartitionof Delaware Application September-13, 1952, Serial No. 309,420

14 Claims.

present invention relates in general to indicatifig systems but isconcerned more "particularly with an arriral and dehafrtdre in'd'ieatingsystem for any desired type or transpire tatioh system wherein isplayjpaireis may be selectively esereteu to dis la travel 'ihforfhatioh,such as the flight :or route "number, the scheduled arrival anddeparture tunes, the due arrival and de arture times, the ste ping ritsor cities enro'u't'e, and other special i'ndi oils such as on time,""deiayew o'r ieerrceiierif The prihcipal object "of the invention is toprovide an improved display system er the above mentioned characterwhich may be easily and quickly chan ed "from a control 'oseratorshositio'h.

one or the features tithe invention relates to the provision of fixedcode'marking means which is common to all display panels and the m answhereby the fixed code marking means effec t'ive'ly operates only thedispleyme-a'ns 01 the "selected dis lay "panel Another feature relatesto the means for dis playing special inibrrrretion, such as, on time,delayed, or "ca'ncelled ihstead er the usual due time of a scheduledflight.

A further feature relates to the means where'- by the display apparatusfor "displaying the flight number and the scheduled time Of arrival ofthis flight number is controlled by cemmon fixed code marking meanswhich deselected hy dishing this sight number 'while the displayapparatus for displaying the 'du'e 'time of arrival, o'r departure, iscontrolled by dialling digits eerresponding to the "due time. 1 l

other features of the invention will become aep'areht from the followingdescription 'of the apparatus "and drawings.

General description .10 and "11 show a pilot selector for coritrollingmechanical indicators at the control operators position.

Fig. 12 shows a front View or one of the mechan'ical "indicators. I

Fig. 1'3 illustrates the alinelrient of Figs. 2 to 6 massive.

A general descrii ti'oh of the system will 'noW be'given. Each orfiee,ih'cludih'g the control ofrice and the remote 'offices, includes botharrival and deeerture panels for isplaying travel ihformatio n topassengers. The ihventi'on is being described in cohnectieri with anairways transpd'rteftioh system and it 'Will be uflde'i'stood thatsubstantially the same arrangemeht could also be used on othertransportation system such as on railroads or bus lines. For example,the arrival and departure panel's display the flight or train number,the s'chedmedtime of arrival and departure, the "due? arrival and dearture times, the city or destination stopping points for thisparticular flight, arra other information such as 0T1 time," fdelaYd 01"cancelled, as indi- Gat d n Fig. 7. Any number er display panels couldbe provided in each office and ten arrival errd ten departure anels areillustrated in Fig. 1.

The control trace is connected to the remote ofiices ever a two-conuctor loops-11d each 'ofiice contains sufficient equipment to displaythe desired ihforr'riatibh. display equipment in each qrfice iseo'ri'tibl'le'd over this loop "from the control office tosimultaneously display correspending information Referring now to Fig.1, the control operator, after receiving flight information over theusual channels, dials a first "digit to operate panel selecting switchMSP to select the desired arrival and departure atreis it is desired todisplay this particular flight information. This I p I 40 selectionwipes out any aret'ious display on these Referring new to the drawings,001211 n'g selected 'panels and conditions only these panels Figs. r-is,the show suii'icieht amount or eq ip merit in arrival enei departuretrahs ortat-ien indicator system to enable the invention to beuhderstoed.

I61 operation. Cbfitiol d'p fatfil 110W dials a three digit flightnumber thereby Operating switehes MSW and FSQto select and operate apartic r set of sang flight relays. The various ,1 sie' remmetticahyrepresents the system. sets or ni ht-relays are eross-eenneetee throughire 2 to s, inclusive represent, iii part, the a flight aistr-ibutmerrame a r-1d control contacts detail circuits for controlling theindicator dis- 'i'ey eaneis. I A

shows an errivm and a departure display p'ahel.

Fig. 8 shows the lamp arrangement rer each numerical lamp group. H

'ig. 9 shows a code chart indioating which of the relays of Fig. 6 areoperated to display a particular digit.

for code marking conductors extending to the 1amp relay grou s which inturn control the lamps the numerical ""iiight arid schedule lamp groupsOf the 'Slt'eitl ii'Jf-iIS.

The control operator hext *ljials a rear digit CO-Tr'Spfi'rl'dihg' tothe due arrival time of "the dial-led flight nuri-fber. switch MS]; isoperated one step for each "or these four digits to successively operatedue relays, such SD as 3 shown in Fig. 4. Code switch MCS is operatedone step for each impulse of each digit to code mark conductors throughthe then operated due relay to control lamp relays associated with thedue arrival lamp groups. Switch MOS is automatically released after eachdigit in order to successively code mark conductors through thesuccessively operated clue relays. The operated lamp relays control lampgroups in the "due arrival numerical lamp panels to display the duearrival time on the selected arrival panel.

The control operator finally dials four more digits, corresponding tothe due departure time, thereby operating switches MSD and MCS tooperate lamp relays and lamp groups in the selected departure panel tocause the due departure time to be displayed on the selected departurepanel.

Instead of displaying the due arrival time on the selected panel, the ontime, delayed or cancelled compartment lamps can be operated to give acorresponding indication.

In case the control operator is located at a position where the operatorcannot observe the setting up of the new displays on the display panels,pilot display equipment consisting of mechanical indicators are providedat the operators position for indicating the flight digits, the duearrival digits, and the due departure digits on sets of pilot indicatorscorresponding to the display panels These indicators provide theoperator with a check on the proper setting of the display panels.

The panel selecting switch MSP is a well-known so-called minor switchhaving a rotary magnet for stepping its wiper step-by-step, off-normalsprings which close on the first rotary step from normal, and a releasemagnet for restoring the wiper to normal. Switches MSD, MSC and MSW aresimilar minor switches. The switch FS is a well-known Strowger verticaland rotary switch having a vertical magnet for operating the wiperswitch shaft in a vertical direction in response to a first receiveddigit, a rotary magnet for rotating the wiper switch shaft to cause thewipers to engage a desired set of bank contacts in accordance with thesecond received digit, and offnormal springs which close on the firstvertical step of the shaft, and a release magnet for restoring the wipershaft to normal. There are eight wipers on the shaft, each wiper havingaccess to one hundred bank contacts. The switch MSW selects the desiredwiper of switch FS thereby making possible eight hundred selections,

or flights.

Detail description each comprise twenty-four lamps for displaying theflight number. SLI, SL2, SL3 and SL4 are similar lamp groups fordisplaying the scheduled arrival time while DLI, DL2, DL3 and DL4 aresimilar lamp groups for displaying the due arrival time. lamp, such aslamps 533, 534, 523, 543 and 553, for lighting the compartment todisplay stenciled information on a. translucent cover plate. Thestenciled information corresponds to the words flight, scheduled, due,Seattle, Portland, etc.

One of the display panels is diagrammatically illustrated in Fig. 5.FLI, FL2 and FL3 are the numerical lamp groups (like Fig. 8) fordisplaying the flight number and FRI, FR2 and PR3 are Separatecompartments each having a the lamp relay groups (like Fig. 6) forcontrolling their respective numerical flight lamp groups. SLI, SL2, SL3and SL4 are similar scheduled numerical lamp groups controlled by theirrespective "scheduled lamp relay groups SRI SR2, SR3 and SR4. DLI, DL2,DL3 and DL4 are similar due numerical lamp groups controlled by theirrespective due relay lamp groups DRI (Fig. 6), DR2, DB3 and DR4. Onlyone of the lamp relay groups DRI is shown in detail in Fig. 6.

The relays shown on the left hand side of Fig, 5 are the destinationrelays controlled by the flight relays of Fig. 3 for illuminating thecorresponding compartment lamps in one display panel. Similar relays arein each of the display panels.

Fig. 3 indicates a group of flight relays which are common to all thearrival and departure panels, and shows three flight gang relays FR, SCand DD which are individual to one flight, in this case flight number406. There may be as many as 800 flights, each flight having its threesimilar relays. The three gang flight relays of each flight areconnected in multiple to a right hand terminal of a flight distributingframe FDF. Each left hand terminal of the flight distributing frame isconnected to a particular one of the 800 bank contacts in the eight setsof bank contacts of flight selector FS. Jumpers can then be used toconnect any flight relays with any desired bank contact; the jumperspermitting ease in changing flight numbers The contacts of all flightrelays, such as FR and SC, are connected to the right hand terminals ofa code distributing frame, CDF, from where jumpers may be connected tocertain of the left hand terminals and ground in order to code markcertain of the conductors extending from these contacts. The conductorsextending from these contacts are connected to the respective lamp relaygroups, such as shown in Fig. 6, for controlling the lamp relays thereinin pairs according to the grounded code markings on these conductors.The conductors extending from the flight relays FR control the flightlamp relay groups FRI, FR2 and FR3 (Fig. 5) which in turn control theflight numerical lamps in the numerical flight indicators, such as FLI,FL2 and FL3 (Fig. 5) in all panels.

The contacts of the flight relays SC are code connected through the codedistributing frame in a manner similar to that of the FR relays and codemark the conductors to the schedule lamp relay groups SRI, SR2, SR3, andSR4 (Fig, 5), which in turn control the schedule numerical lamps in thenumerical schedule indicators, such as SLI, SL2, SL3 and SL4 (Fig. 5,),in all panels.

The contacts of the flight relays DD are cross connected through adesignation distributing frame DDF to ground certain of the conductorsextending to all the panels so as to control the destination relays,such as relays 52G, 53?), 540 (Fig. 5) etc. These destination relayscontrol the due, scheduled, flight and city destination lamps in theircompartment panels, as indicated in Fig. '7, Jumpers are used on thecode distributing frame CDF and on the destination distributing frameDDF in order to easily change to any desired code markings to anydesired city destination.

Detail operation The control operator operates the lever key K therebycompleting circuits for operating relays A in the cordrol officail inthe remote :office, and A in the last mince over .a control trunkextending in series through the respecti eofices. Relay A at contactsdds completes an obvious circuit .for operating relay .3. Relay atcontacts 2 It prepares locking circuits for the transfer :relays Tl to.Ts inclusive; at contacts 212 prepares a pom-t in the pulsing circuit;at contacts M3 opens the release circuits .for the release magnets ofswitches Ill-SP, and M3131; and at contacts 2M opens one point in therelease oircuit to code switch MSG.

The control operator new 'dials the first digit to select the desireddisplay .panel in both lthe arrival and departure .groups. The relay ain the local and remote oiiices fall back for each impulse of thedialled (digits. Assuming that the first panel in the arrival anddeparture groups is to :be "selected then the control operator will dialthe digit .1 to transmit l impulse. to re sponse :to :Ethis impulseirelay A restores at contacts see momentarily opens circuit toslow-release relay which relay, however, is maintained in operatedpos'i'timi 51. 'ng the limpulsing period. at icon-taste rel-.y r 20311-pletes a circuit for operating slot ele eri'es relay 3C and the rotarymagnet of tire selecting switch M31 is oh may be traced as follows: fromplot-mil, contacts 2M, 212, 222, :one branch extending winding of relayC to battery and the other branch extending by way of contac as 261i,225? and through the winding of trot r3 net 2 84 to battery. Relay C isalso a slow to release relay and is maintained operav during thedialling period and release-s hontly thereafter. at contacts 2356 relayC so a :circuit for operating slow to release Relay C at contacts 231}also completes cuit through contacts .255 and through the lows andupper-windings of transfer relay Tl to r tery. At contacts 232 relay "Copens :a point in the release circuit for code "switch .N C and atcontacts 233 opens a point in the catsuit extending to wiper 9% ofswitch Rotary magnet 29d of panel selecting switch MSP operates itswiper it? one step in response to the first digit to engage its firstbani; contact terminating conductor P! "which extends to the number 1arrival and departure panels. ductors P2 to l 'lil, inclusive includedcable 25%, extend respectively to only their corresponding panels.operation of wiper 1'; i to its first bank contact has thereforeselected only the number 1 arrival and departure panels. tire first stepof the rotary magnet the normal contacts 2% close to prepare a circuitrelease magnet see. Relay 'C-R, upon energizing, at contacts .Z- iIprepares a circuit for grounding wiper 229 of switch MSD for a purposeto be described later on; at contacts are opens a point in the releasecircuit for code switch MSC and at contacts 2 62 grounds wipers 2% 2H3of code switch MSG.

The transfer relays Tl to T4 are differential two step 'relayswhichclose only their 3 con-- taste 2.5 to 253! on their first step. Relay Tl, upon energizing in its step, closes only its X contacts 25-! therebyconnecting ground at contacts 21! through the upper winding of rei layT! to short circuit this "upper winding to ground at contacts 23!. Thisshort circuit '-prevents thefull operation of this relay.

After dialling the first digit, the relays A are re-energized over thedial loop and after an interva-l slow to releasemelay C restores.Eontacts 232 of :relay C grounds wiper 229 without effect at this time.Contacts 2-3.1 open the circuit to relay CR and at the same time removesthe short circuit through the upper winding of relay Tl therebypermitting relay Tl to fully operate in its second step. This circuitmay be traced from ground at contacts an, L the upper and lower windingsof relay TI to battery. In this circuit the upper and lower windings nowaid in the operation of this relay. Slow to release relay 0R restoresshortly after relay '0 without-effectat this time. Relay Ti, uponenergizing in .its second step, at contacts 2&2 opens (a point in itsinitial circuit, at contacts connects battery through resistance Rthrough the upper winding of transfer relay I32, at contacts 215 itransfers the initial operating circuit to relay T2, at 255 opens '-apoint in its. initial operating circuit, at contacts 2% and 25 cranstersthe pulsing circuit from the panel selecting :switch MS? to the switchMSW, and at contacts 25% connects battery to wiper Ell? and conductor Plof wiper 2&3 to energize the locking relays L (Fig. 5) in the number onearrival and departure panels.

Elhe circuit foroperating the locking relays LK may be traced asfollows: from ground contacts 258, common conductor 2-93 mult-ipl-ed toall panels, through the winding of relays LK to conductor P! in cableM8, first bank contact and wiper .20! of panel selecting switch MS]? tobattery at contacts 258. Looking relay LK at .contacts *5 l ldisconnects ground from the individual I lock-ingconductor 500 tothereby unlock and-restore any operated panel relays such as relays 52Bto 590 inclusive in the selected arrival and departure panels to therebywipe :out any previous display on these panels. The disconnection ofground from individual locking conductor tilt also causes therestoration of any operated lamp relays in the lamp relay groups ml, 2,3-: SE4, 2, 3, 4: and URI, 2,, 3 4 such as shown in detail in Fig. 6 anddiagrammatically in Fig. 5. The restoration of these previously operatedlamp relays will therefore wipe out any previous display in thenumerical lamp groups.

The control operatornow dials the seconddigit which is the first digitof the flight number and which is assumed to beflig-h't number 106'. vInresponse to dialling the first flight digit 4 relay A restores andre-energizes l times to operate rotary magnet of switch MSW as follows:from ground contacts 52m, .252, 222 one branch energizing relay Glandthe other branch extending by way of contacts 28], 92W, 2671, -2556,conductor .295 and through the winding of rotary magnet 360 to battery.Rotary magnet'elw steps the wiper 3&3 four steps to "select wiper 32d ofthe flight selector FS. Off normal contacts 205 of switch .MSW close onthe first rotary step.

Relay B is held operated during the pulsing.

period and relay C re-operates relay CR and causes the operation oftransfer relay T2 in its first step. The circuit for operating relay T2in its first step may be traced as follows: ground at contacts 231.,2'54, 265 one branch extending through the lower winding of differentialtransfer two step relay T2 and the other branch extending through theupper winding, contacts 262 and 253, resistance R to battery. Relay "T2being diiferentially wound operates in its first step to close only Xcontacts 26!. The closure of contacts 215i completes a ground shortcircuit through the upper winding of T2 to prepare for fully operatingthis relay when the short circuit is removed by the deenergization ofrelay C.

Relay C and then relay CR restore shortly after the second digit andrelay C removes the short circuit from the upper winding of relay T2 topermit relay T2 to fully operate through its second step. This circuitmay be traced from ground contacts 2| I, 26I, through the upper and.lower windings of relay T2 to battery. Relay T2, upon energizing in itssecond step, connects battery through resistance R and contacts 263 and212 to the upper winding of relay T3; at contacts 264 prepares theinitial energizing circuit for relay T3; at contacts 265 opens itsinitial energizing circuit; at contacts 266 and 251 transfers thepulsing circuit from the switch MSW to the vertical magnet 3| I of thefiight selector FS; and at contacts 268 opens the circuit to the lockrelays LK in the number 1 arrival and departure panels.

The restoration of the lock relays LK in these panels at contacts Iagain grounds the individual locking conductor 500 to prepare lockingcircuits for the lamp relay groups and the panel relays such as 520 to590.

The control operator now dials the third digit 0, corresponding to thesecond digit of the fiight number, causing relay A to transmit impulsesto the vertical magnet 3II and to re-operate relays C and CR. Thecircuit for operating the vertical magnet 3II may be traced as follows:from ground contacts 2I0, 2I2, 222, 281, 256, conductor 298 and thevertical magnet 3| I to battery. The vertical magnet operates the wipersof the selector 10 vertical steps opposite the tenth level of bankcontacts. The vertical off normal springs 3I2 operate on the firstvertical step of the wiper shaft to prepare a circuit for release magnet3I3. The operation of relay C causes the operation of transfer relay T3in its first step in the same manner as previously described fortransfer relays TI and T2.

Relays C and CR again restore shortly after the third digit and relay Cat contacts 23I removes the short circuit from transfer relay T3 tocause this relay to operate in its second step. At contacts 216 and 211the impulsing circuit is transferred from the vertical magnet 3II to therotary magnet 3I0 of the flight selector PS.

The control operator now dials the fourth digit 6, which is the lastdigit of the flight number, causing relay A to transmit 6 impulses torotary magnet 3I0 and to re-operate relays C and CR. The circuit foroperating rotary magnet may be traced as follows: ground contacts 2H1,2|2, 222, 281, 216, conductor 291, and through the winding of rotarymagnet 3|Il to battery. The rotary magnet steps the 8 wipers 32| to 328,inclusive, 6 rotary steps to engage the sixth banl; contact in the 0, orselected level. The operation of relay C operates transfer relay T4 in amanner similar to that previously described for the other transferrelays.

The slow to release relays C and CR restore after the fourth digit andrelay C at contacts 23I removes the short circuit from transfer relay T4to cause this relay to operate in its second step. Relay T4 at contacts284 prepares a digit pulsing circuit for rotary magnet 225 of switch MSDand at contacts 286 and 281 transfers the impulsing circuit from therotary magnet of the fiight selector FS to the rotary magnet 2 I 5 ofthe code switch M80.

The control operator now dials 4 more digits corresponding to the duearrival time of this flight number 406 in order to display this duearrival time in the numerical lamp due section on the selected arrivalpanel. Assuming that for flight 406, the due arrival time is 1:20, theoperator will accordingly dial the digits 0, 1, 2, and 0.

In response to dialling of the fifth digit 0, which is the first digitof the due arrival time, the relay A is operated 10 times to step wipers2I8 and 2I9 of the code switch MSC 10 steps. The circuit for operatingthe rotary magnet 2I5 and the code switch may be traced as follows:ground contacts 210, 2I2, 222, 286, rotary magnet 2I5 to battery. Theoff normal contacts 2|6 close on the first rotary step of switch MSC toprepare a circuit for the release magnet 2 I1. Relays C and CR operateas before and relay C closes a circuit for operating rotary magnet 225of switch MSD to step wiper 229 into engagement with its first bankcontact. This circuit extends from ground, contacts 23I, 254, 264, 214,284, and the winding of rotary magnet 223 to battery. Off normal springs22B and 221 close on the first rotary step of wiper 229 from normal.

After dialling the fifth digit relay C restores shortly before relay CRrestores and at contacts 232 completes the circuit for operating duerelay SDI as follows: ground, contacts 232, Ml, wiper 229 in engagementwith its first bank contact, conductor SI and through the winding ofrelay SDI to battery. At contacts 233 relay C completes a circuit tooperate the selected flight relays FR, SC and DD as follows: ground,contacts 233, off normal contacts 226 of switch MSD, conductor 296,wiper 303 in engagement with its fourth bank contact, wiper 324 inengagement with the sixth bank contact in the tenth level, conductor 330extending to a left hand terminal of the fiight distributing frame FDF,jumper 33 I, right hand terminal of FDF, conductor 332 and through thewindings of relays FR, SC, and DD in multiple to battery. Relay SDIcompletes circuits over its contacts 4I| to M5 while relay CR is stilloperated for energizing certain lamp relays in lamp relay group DRI Fig.6 of the selected arrival panel in a manner to be described in detaillater on.

Flight relay FR, upon energizing, at its contacts 34I and 345 completecircuits for energizing lamp relays, corresponding to relays LRI andLR5, in the flight lamp relay group FRI. Only one of the lamp relaygroups is shown in detail in Fig. 6 and it will be understood thatsimilar lamp groups are provided, one for each numerical lamp indicatorin each panel. With this understanding the circuit for operating relayLRI in the flight lamp relay group FRI may be traced as follows: fromground (Fig. 3) left hand terminal of code distributing frame CDF,jumper 333, contacts 34I, conductor 342 in cable 395 extending to thefiight lamp relay groups FRI in the number one arrival and number onedeparture panels, over a conductor corresponding to conductor 45I inFig. 6, through the upper winding of relay LRI in the FRI lamp relaygroups to common conductor PI in cable 208, first bank contact and wiper201 of panel selecting switch MSP, and contacts 258 to battery. Asimilar circuit is partially completed over conductor 342 of cable 305to the other flight lamp relay groups in all of the other panels, butthis circuit is not completed because the panel switch MSP has selectedand connected battery to only the number one arrival panel and to thenumber one departure panel. Since battery is not connected to the otherpanels 2 to II], inclusive,

9 only the lamp: relays of the selected panels can be operated.

The circuit for operating the relaysliR' in boththe selected arrival anddeparture panels may be traced asfollows? ground Fig. 3, left handterminal of code distributing frame CD-F, jumper 3-34, contacts 54conductor" 3% incable 305 extending to the flight lamp relay groupsFRlin the selected panels, over a conductor corresponding to-c'oncluctorltfi in 6 through the winding of relays LRE in the: FBI lamp" relaygroups to common conductor F l in cable: 268 which is connected tobattery through wiper Zll'l. Since-the panel selecting switch- MS? hasselected only the first arrival and departure panels by connectingbattery to conductor Pl; the: lamp relays" of the other panels are notoperated; V

Relays LR1= andIJRS in lamp relay groupsERl in the number I arrival anddeparture panels operate and complete locking circuits through theirlower windings to panel locking conductor 5%, which is grounded atcontacts 51ft their individual panel locking relays LKL With. relaysLRland LE5 in lamp relay group FR-1i" operated thelamps 3", 6 I; 9", Hi3, l4,- l 5 ll-B, l9-=and.23 (Fig. 8) in lamp group Eli: are'illuminated. to display the digit The: oircuit forf lighting lamp 3extends from ground, contacts; 659: to: terminal 3 which is conneot'e'dto lamp 3- of Eig; 8. and battery. The circuit for lig'htinglamps t1 and13 extends from ground by way'of contacts: 6211 14,. 655 and 624- toterminals and? [33 which are: connected' to lamps-e and I 3 andiibattery: a similar manner circuitsfor illuminating. thexremaining lam-psmay'betraced tol the operated contacts ofrelays LR! and LEE for:outlining. the. digit 4. Relay also 'completes grounded code markingcircuits -throu ght contacts: 354'. and: 355:" and over conductors355:2;1'1'd 3i5l: for operating two lamp relays, corresponding to:relays; 1.34: and LE5", in lamp relay group FPRZ inithe: selected panelsin armanner; similar-to that described. for the operated; lamp; relaysin group- Thesev relays LEA and complete circuits -to. illuminatecertain lamps in combination. in lamp groups. E142 to. display thedigit0; I r

In: addition relay ER at contacts 352. andiiii l codemark conductors:36-3 and-v 3'55. operate 2 lamp relays; corresponding to relays and ma.inlamp relay groups in the selected panels inahmanner similan to thatdescribed for the operated: lamp-relays in g-roup, Ill-til "lhese relaysand; LRE complete circuits. toilluhii' nate. certainlampsin.combinationiih. lamp group's FLito display the digit-01. r H

In additionrelay at contacts. and 3'86 code mark conductors. 3353 and3:55 operate 2 lamp relays, corresponding. to relays LE2 and LEM,inlamprelay groups in the selected panels. in. a similar. manner. Theserelays DB2 and LRi' complete. circuits in lamp" groups: todisplay thedigit 6? The operational the-flight relay has. accordingly causedthe-number 1 arrival and the number 1 departure panels to displaythe'fiight numbers 86 on the lamp groups EM" and" I I The. operatedrelay' SCatconta'cts 35"! and 352 code mark circuits for operating lamprelays EEG and LE2 in lamp group SR1, at contacts 36! and 353 operaterelaysliftiandLR-S in lamp group SR2 at contacts 3l l an'd 315 operat'erelays LXI-ts and LR lS inlamp group SRt and at contacts M2 and 313operate Iamp-relays LEZ and LE3 inthe selected arriyal' panel;Similan'circuitsare closed by relay SC'over cable tu s to tne scheduled;lamp the selected departure panel display s duleddeparture time orflight which i is instance is a'ssum'ed to be 12:15.

The operation of the destination relay DD clhs'es circuitsoperating thedestination r'elays, su'clr as relay 55ft, Bet -5% over cables 3% and:3&8: the selected arrival and departure panels: For?example-destinationrelay as i] controls the lignting oi the Seattle panel compar-trdentlamp 543 is. operated over a. circuit extend fiomgrouncl efthandterminalot the destination. distributing inane DEF,- moer, contacts eta}conductor 39's? in. cable 3%; upper winding-0f relay to panel conductorP t. which is connected to battery as previously. described.

a similar manner the: desired destination relays 536, 5 35', 55m} 5365;-Bllti and etc. are operated both the selected arrival and departu-re'panelsto control. their respective corripartinent lamps: to display thestopping points imthissselected fligiit-.. Asishown, relay swoontrol's'the lighting: of thefli'ghttandi scheduled: cornpartrrrentlamps. and;535 These destination relays, upon. operatinga close locking. circuitstlnnugh their lower windings to panel lmking conductor 5% 'whicii'isgrounder-i: at contactsell otloekingirelaylllsl.

specialioperating; and lockingci'rcuit is provid ifor p'anelirelay iiz twhi'ch controlsrthelighti ng ofi the due lamp I 5 23; The: circuit forto'p'er.- atin-g 'relay 52fmay be traced. astfo'llowsc. groun d contacts;2123,. conductor: 255.95, contacts 38 is, upper Winding of relay 5% tobattery onrconduetor'Pl. Relay 52 or operates? to? light-the dua lamp523 and at contacts- 521i: noses: a: locking circuit through its lowerwinding? which is controlled by lamp r'elay the lamp relay-group DR Iovenc'onductprs 5W and 5th and contacts E343.

Hetlirning now to thetime shortly atter dialrelay SD1 was operated aspreviously described; it" will he remembered that the code switch-Mile;has been operated ten stepstocause its wipers are and 2T9 to engagetheir tenth bank contacts. Before relay" CR falls hack the'wipers 2186111 2] 81" are. grounded to thereby connect ground to conductorsCW'andCEtG'cDmpIete circuit s'through operatedcontacts t 1.43" and ii 5-of" relay SDiand over. conductors and sea for operating" lamp relays"LE4. and: LE5 lamp relay group D-R l ill Blight? neiaysLREandLRFOpera'te and completeilocki'ng circuits. through their lowerWind?- ings. to. lockingcon'diicto'r 5 Hi] 1 ilamp relay" group DRIcorresponds 'to the tens hour of'the" due arriyall timer the digit 1 isthe only digit in the tens. houn, the circuits controlled by thelampirelays LR ingroupDRl have been arranged solthat. the connectionsfrom the terminals. which extends-tol-the-lamps: of. Fig. 8 areonlyconnected sdthat-theztensw numeral 1 only can be'd-isplayed. Theconnections. between. the: lamps and these terminals are disconnected.-to prevent: the. operated LRirela ysfrom" displaying thenumerals 2 to;lorinclusivai Undenthis. condition the transmission oii tlie digit 0 forthe: first and: tens hour digit of the due time is not displayed on thelamp group DL4 and is thereby left dark.

Relay CR releases shortly after relay C restores and at contacts 243removes the code markings from conductor C4 and C5. At contacts 24!relay CR opens the circuit to relay SDI which restores and at contacts242 completes a circuit for operating release magnet 2|! of the codeswitch MSC as follows: ground contacts 232, 242, 011' normal contacts 2l6, and through the winding of release magnet 2 IT to battery. Theoperation of release magnet 2|! restores wipers 2l8 and 2H! to theirnormal positions and opens the off normal contacts 2 I 6 to open thecircuit to release magnet 2 H.

The control operator will now dial the sixth digit which corresponds tothe units hour of the due arrival time. Assuming that the due arrivaltime is 1:20, the operator accordingly dials the digit one to causerelay A to restore and reoperate relays C and CR and to step the codeswitch MSC one rotary step in the manner previously described. Theoperation of relay C again completed the circuit for operating therotary magnet 225 of switch MSD to step wiper 229 to engage its secondbank contact. Shortly after dialling this sixth digit relay C restoresbefore relay CR and completes a circuit for operating relay SD2 asfollows: ground contacts 232, 24!, wiper 229, conductor S2 and throughthe winding of relay SD2 to battery. Relay SD2 at contacts 42! and 422complete circuits for operating lamp relays LRI and LR2 in lamp relaygroup DR2 from grounded contacts 243, wipers 2 I8 and 2 l9, conductorsCI and C2, contacts -42l and 422, conductors 461 and 462 in cable 40lextending to lamp relay group DB2, and through lamp relays LRI and LRZto the individual panel conductor Pl which is connected to battery overwiper 201 and contacts 258. Relays LRi and LRZ in group DR2 completecircuits to the lamp panel DL2 to display the digit 1 in a mannerapparent from the foregoing description.

Relay CR restoresshortly after relay C to open the circuit of relay SD2at contacts 24! and at contacts 242 again completes the circuit forrestoring the code switch to normal position.

The control operator now dials the seventh digit corresponding to thetens minute of the due arrival time. In response to dialling the digit 2relays C and CR are re-operated and the code switch MSC wipers arestepped to engage their second bank contacts as previously described.Relay C again operates rotary magnet 225 to step wiper 229 to its thirdbank contact. Shortly after dialling this digit relay C restores tooperate relay SD3 over conductor S3. Relay SD3, upon operating, atcontacts 43! and 433 complete circuits for operating the lamp relays LRIand LR3 of the lamp relay group DR3 in accordance with the setting ofthe code switch MSC. These lamp relays operate in a manner apparent fromthe foregoing description in lamp panel DL3 to display the digit 2.Shortly after relay C restores relay CR will restore to open the circuitto relay SD3 and to cause the code switch MSC to restore to normal aspreviously described.

The control operator now dials the eight digit according to the unitsminute of the due arrival time. Relay A in operating transmits impulsesto step code switch MSC to its tenth bank contacts. Relay C operates therotary magnet 225 to step wiper 229 to its fourth bank contact toprepare the circuit for operating relay SD4. Relay C restores shortlyafter dialling the eight digit to ground conductor S4 and operate relaySD4. Relay CR, being in operated position at contacts 243 groundsconductors C4 and C5 through wipers 2l8 and 2H! and extends these codeground markings over contacts 444 and 445 of relay SD4 to conductors 484and 485 included in cable 403 to operate lamp relays LR4 and LR5 ingroup DR4. The operation of these latter relays control circuits forlighting the lamps in DL4 to display the digit 0. From the foregoingdescription it will be seen that the selected arrival panel now displaysthe flight number 408 the scheduled arrival time 12:05 and the duearrival time 1:20 as well as lighting the schedule, due, flight, anddestination compartment lamps.

The control operator now dials 4 more digits corresponding to the duedeparture time of this flight 406 in order to display the departure timein the due lamp panels on the selected departure panel. The code switchMSC responds to each impulse of each dialled digit to code mark theconductors CI to C5 in accordance with each digit dialled and releasesto normal after each digit in the manner previously described. The duesequence switch MSD takes one step for each dialled digit tosequentially operate successive due relays, corresponding to relays SDIto SD5. These due relays, indicated by the rectangle in Fig. 2, aresuccessively operated over conductors S5 to S3 to extend the codedmarkings on conductors CI to 5 over the conductors of cable 200 tocontrol the lamp relays in the respective lamp relay groups of theselected departure panel in a manner similar to that described for theselected arrival panel. Assuming that the due departure time is 1:50,the control operator dials the digits 0, 1, 5, and 0 to cause the duedeparture lamp to display 1:50; the 0 digit of the tens hour is notdisplayed for the same reasons set forth hereinbefore and such lamppanel is left dark.

The selected departure panel has now been operated to display the flightnumber 406, the scheduled departure time 12:15, the due departure time1:50, and the desired compartment lamps have been lighted to display thedesired information and stopping points.

Referring to Fig. 7, it will be seen that each panel has three specialcompartments for displaying on time, delayed and cancelled. When flight406 is on time there is no need to display the "due time since it wouldbe the same as the schedule time. The same is true for a delayed flightin case it is not known when such flight is due. Also, if a flight iscancelled it will naturally have no due arrival or departure time.Special circuits have been provided so that when any one of the threeabove conditions are to be displayed, the due lamp panels will notdisplay any digits.

It will first be assumed that the panels shown in Fig. 7 are to beoperated to display that flight 406 is on time in which case the duelamp panels will be dark. The control operator dials the first digit 1to select the desired panels, then dials the flight digits 4, 0, and 6,and then dials the on time digit 5 to cause the selected panels todisplay the flight number 406, the scheduled times, and the desiredcompartment destination stopping points as previously described. Thedialling of the on time digit 5 causes the due compartment lamp 523 tobe extinguished and also causes the compartment on time lamp 5 toilluminate its compartment.

Before describing the detail operations for causing the lighting of theon time lamp, it

should be mentioned that the lamp relay'groups, such. as: DRll,-Fig. 6,for controlling the lamp panels,v such. as: DLt, have additionalcircuits provided especiallyfor operating the on. time, delayed andcancel? lamps. It should also be mentioned that the;terminals.: forcausing: the display of digits" 2 to in. the lamp. panels-D151 are left;disconnected. so.- that the lamp: panels DLi can only displaythedigit;l. as there are no tens hour digits. beginning with: digits 2 to 0,inclusive; Under these: conditions. when. the; on time digit 5,. thedelayed? digit. 9, or the. can.- celled digit 8 is: dialledcorrespondingly numbered digits arexnot: displayedvon the-lamp; panelsDLI.

In response to dialling the on time digit for the fifth digit; the codeswitch MSG: is up.- erated to ground conductors C2 and C3; and therelease of relay C operates relay $13! to connect grounded conductors orand C3. to conductors 452. and 353 byway ofcontacts 4-12 and M3. tooperate relays LR? and LE3 in group DR! over conductor P1 which isconnected to battery. Relays LRZ and LRt operate and lock tocon.- ductor56d and at contacts 63! and 6 ground conductor 564 110 light ontime'lamp 514- in the selected-panel. Relay LR3 at contacts 635 opensthe locking circuit of relay-52ll-which deener-gizes and" extinguishesthe: due compartment lamp 523 cuit for-operating relay E as follows:ground, contacts 416, conductor 29!, lower winding of relay E;conductor- 292, contacts 632, conductor Pt to battery through wiper 201-and contacts 258. Relay E at contacts 2-2! locks to grounded contact 21I; at contacts 222 opens the pulsing circuit and the c'ircu-it'of relayC to prevent any subsequent pulses from being effective, and at contacts223 opens the original energizingcircuit of relay fizdto prevent itsreoperation;

In case the delayed-digit 9 is-dialled in place of the on time digit;5-, the code switch MSC is-operated to ground conductors C3 and C5 tooperate-relays LR% and LRFi. in group DRI. Relays LRs and LRdloclcoperated and; at contacts 63 I andfil l grounds: conductor 5112 to lightdelayed lamp 5 l 2 in the selected panel. RelayLRS causes the due lamp523,: to be extinguished andfcompletes, the circuit for operating relayE.as previously described.

Incase the cancelled digit 8 isdialled: instead of the ontime ordelayeddigits;,. the code switch" MSG is operated to ground con ductors, C3'andC4 to, operate. relays. LE3 and LE4 ingroup; DR'I. operated" and. at.contacts t3l and. 621: grounds conductor 5.03. to light cancelled lamp513111 the selected: panel. Relay LE3 causing the due lamp 523' to be;extinguishedand relay E to be operated as previously described;

Referring now to- Figs. 10 and 11, a general description-will firstbegiven when it is-necessary to provide the control operatorwithamonitoring or a so called pilot selector to enable the operator tocheck on the setting of thedisplay panels which arenot visible from theoperators position. The contacts 209 and 219" of relay A (Fig. 2) areshown in Fig. 10 for-con trolling relayssimilar to those shown in Fig;2. The sequence switch MSD and the indicator selecting switch MSP" areminor switches similar to switches MSD andMSP of Fig. 2. Thebankcontacts of switch MSD' are multipliedto corresponding individual dueindicators in each indicator set over conductorsDl toDB and con- RelayLE3 at contacts 632 completes a cir- Relays LRS and LRd' lock ductors;E! to. E3. are similarly multiplied; to oo1iresponding: individualflight ind cators each indicator. set. The, first bank. contacts; of.switch MSP are multipled: to all; individual indicators in only'thefirst indicator. set: and the remainin bank. contactsv are. multipled totheir respective indicator. sets, it being; understood that there isanindicator setrfor each set of display panels, each display setcomprising an arrival display panel and a departure; display panel.

Fig. 11 shows: only one. set. of. inclicators;.. cor.- responding to thenumber. larrival and departure display panels, on which the flightnumber 3.6.6, the: due. arrival: time 6.1.226; andthe due departuretimes 01:50 are displayed- The; indicator sets: 2 to Iili arev notshown; The flight indicator on which the. numeral is displayed.- is:shown in detail in the upper portion of.Fig=. I1... Thes.e;:indicatorsare: well. known. and comprise; an; openating magnet for operatinganarmature; enga ing a star wheel mounted on a rotatable: The. drum havingnumerals spaced around its periphery and which arevisible throughaniapenr ingin itsface plate. Mountedon theisamezshatb with the. drum isazcarn for. controlling aset. of

contacts. which control the; circuit of: the. indi cator'magnet- Whenthe control operator closes. the.- key; K (Fig. 2) relay: A. iSbperated.over. the; control. loop and at contacts closes theicircuit'.fGK'ODfiIfllli'n relay B". RelayB! at. contacts: iii-d prepares alocking circuit for relays:- Tl'is to Tit, at: cone tacts 512prepares'ia. pulsingcircuit forrelay Q and switch MEI? atxcontactsi'it;opensthe circuit" to. switches lt-I'SE" and. Milly.

in response to dialling the firstdigit I. to select the desired displaypanels: relay; C." and: rotary magnet its are operatedoveracircuitextending from contacts tit; M2: one-branch extending-to theslow to release-rel-ay'C' and the-othenbranch extending over contacts.i519; and: through. the winding of rotary magnet tilt. to. battery: Therotary magnet ltd. steps the wipe-rs.liifi' and: Hit one step toselectthe first set of indicators: at-the same time that the-number: onearrival andcid'isr play. panelsare selectedjby switch MGR in; Fig; 2.Due totheoperation GflSWitChMSP"01113101168531; of indicators arecondition-ed: forroperatlondee pendentupon the setting. of wipers iii?and-.l68. Relays:C"attcontacts l3:loperates relay: 8-: and:relay CR5,atv contacts. i3 2: disconnects: battery throughresistance-.-R2=fromwiper "fill; The oper-- ation ofreiay Siswi-thout-efiiectr-atxt time. Relay-CR aticontacts miliclosesra'circufor. 0Q? crating Z-step; differential" relay Tllei. in. its first stepto close its X contacts lair. Relayslll l: to TM are similar to relays Tl to (Miami? operate in asimilar manner described: for: relays. Ti; toTd. Atcontacts M2 relay CR? completes the; circuit for operating relayPS. Relay operates and through its: contacts connects. interruptedground to the conductors. includedlincablea-ltfi. to preparecircuits forrestorin any of theroperatced indicators .in the selected. indicator;set.

Shortly after the first digit: relay Cf restoresito open the circuit torelays S andCR'. At'contacts T32 relay C" completes a circuit for causngr'the selected set-0f indicatorsto be restoreditatheir normalpositions before theasl'owrto' releaserelay CR restores and the relay THope-rates. in its second step. The operated ,indicatorswill; have theircontactstlt closed andatxthistimea cirrcuit may be traced. fromgroun-dthrough thesine terrupter- I, operated. contacts of' relay. PS theconductors. included: in: cable. 7.89,. one; such:- circuit multipled toconductor Fl, terminal 8H5 extending to the first fiight indicatorthrough the winding of magnet 835, off normal contacts 812, conductor8|2, terminal 8E3, conductor G: individual to the first set ofindicators, first bank contact and wiper "Jill of switch MSP, contacts132 and through resistance R2 to battery. Similar circuits are alsocompleted through any of the flight, due arrival, and due departureindicators of the first indicator set in case such indicators are not innormal position. In these circuits the motor magnets, such as 898, areautomatically stepped by the grounded interrupter I to step drum 862 andcam 8&5 to normal position at which time the contacts 8! I close and thecontacts 8W open. As soon as the contacts am open the circuit throughthe motor magnet of the indicator is interrupted with the drum 802 inits normal position in which position the indicator will show a blankdisplay.

Relay CR, restores shortly after relay restores and at the contact 142opens the circuit for relay PS to disconnect the interrupter I from theindicators after they have all reached their normal positions. Atcontacts Ml relay CR removes the short circuit from the upper winding ofrelay TI 1 to permit this relay to fully energize and operate itscontacts in its second step in the same manner as described for theoperation of relay Tl. Relay Tl l, upon energizin in its second step, atcontacts 15! completes a locking circuit for itself through its twowindings in series, at contacts 152 opens a point in its originalenergizing circuit, at contacts 153 prepares a circuit for operatingrelay TIZ in its first step, at contacts 154 prepares another point inthe circuit to relay T12, at contacts I55 opens another point in itsinitial energizing circuit, at contact 55% prepares another point in thecircuit for relay Tl2, at contacts l! opens the circuit to relay GB, atcontacts 158 and IE9 transfers the impulsing circuit from rotary magnetWe to conductor Fl extending to the first flight indicator, the contacts135 prepare a stepping circuit for operating the indicator one step fromnormal and at contacts 2'33 prepares a circuit for operating theindicator magnet after it has been stepped from normal.

When the control operator dials the first digit 4 of the flight numberrelay A restores and re operates 4 times. Relay B is a slow to releaserelay and will maintain its armature attracted throughout the diallingperiod. Etelay C is again operated in parallel with the pulse circuitand each time relay A restores an impulse is sent to the magnet 800 ofthe first flight indicator. The first impulse operates the motor magnetetc to step out of normal position over the following circuit: fromground contacts 2), H2, conductor Fl, terminal 8l6, winding of motormagnet 899, ofi normal contacts 8i I, conductor BM, terminal 8E5,conductor l, first bank contact and wiper E08, contact 734, and throughresis ance R2 to battery. The operation of drum 802 from its normalposition steps the lug 866 on earn 805 to open contacts 8 and closecontacts filii in order to prepare for operating the indicator insubsequent steps. The second pulse for operating indicator magnet 800extends over the same path as previously described except that thecircuit now extends by way of contacts 859 which are now closed,conductor 8E2, terminal 813, conductor Gi first bank contact and wiperml of switch MSP, contacts E33 and through resistance R2 to battery. Thethird and fourth impulses step th indicator to display the digit 4through its face plate 804. The first flight indicator has now beenoperated 4 steps from normal to display the digit 4. Relay C at contacts13! again operates relay S without effect at this time and also operatesrelay TM in its first step over the following circuit: ground contact13!, 756, 154, 165, one branch extending through the lower winding ofrelay T12 and the other branch extending through the upper windingthrough contacts 362 and 53 to battery through resistance Rl. Relay TIZcloses its X contacts NH to short circuit its upper winding and toprepare a circuit for fully energizing the relay when relay C restores.

Shortly after dialling the second digit, slow to release relay Crestores and at contacts l il opens the circuit to relays S and alsoremoves the short circuit from relay Tl2 to allow it to operate in itssecond step, and closes contacts 132 without effect since the contacts733 and 73 5 are now closed. Relay Tl2 operates in its second step andat contacts 566 and E61 transfers the impulsing circuit from the firstfiight indicator to the second flight indicator over conductor F2. Inresponse to the third digit 0 the second flight indicator is stepped todisplay the digit 0 in a manner similar to that described for the firstflight indicator. The relay C again operates to operate relay Tl3 in itsfirst step as follows: ground contacts 23L "5'56, 154, T64, T15, throughthe lower winding to battery and through the upper winding to batterythrough contacts H2, 63 and E53. Relay Tl3 closes only its X contact"iii as previously described. When relay C restores after the thirddigit relay T13 is operated in its second step and transfers the pulsingcircuit to the third night indicator at contacts H5. In response to thefourth digit 6 the third flight indicator is operated to display digit 6and relay 0' operates relay TM in its first step. Relay C also operatesrelay S and when relay C restores after the fourth digit relay Tl4operates in its second step to transfer the pulsing circuit to wiper"529 of switch MSD at contacts 586. Relay TM also completes a circuitfor operating the rotary magnet 2'25 of switch MSD before relay Srestores. The circuit for operating rotary magnet may be traced asfollows: ground contacts 535, I36, I34 and through the winding of magnetE25 to battery. The operation of the motor magnet 25 steps the wiper 129to engage its first bank contact and close the off normal contact 72? toprepare the circuit for the release magnet 123. After stepping the wiper729 to its first bank contact the relay S restores to open the circuitof magnet F25. The 3 flight indicators have now been set to display theflight digits 306 and the switch MSD has been positioned on its firstbank contact to select the first due arrival indicator over conductorDI.

In response to dialling the fifth digit 0 relay C is re-operated and 10impulses are sent to operate the first due arrival indicator of theselected set to display the digit 0 as follows: ground contacts 2m, H2,E58, 176, 786, wiper 29 in engagement with its first bank contact,conductor Di extending to the first due arrival indicator, through theoperating magnet and cam springs thereof over the conductors GI and l towipers :0! and through the contacts its and 734 to battery at resistanceR2. Relay 0' re-operates relay S which at contacts 136 prepares acircuit for stepping the switch MSD' another step. After the fifth digitrelay C restores and during the interval while relay S is still operatedthe rotary magnet 125 of switch MSD is operated to step wiper E29 toengage its second bank contact to select the second due arrivalindicator of the selected set. This circuit may be traced as follows:ground contacts 135, 138, 5% and magnet 125 to battery. Relay S restoresshortly after relay C" to release magnet125.

In response to the sixth digit 1 relay C, followed by relay S, areoperated and the second due arrival indicator is stepped one step todisplay digit one over circuits similar to that previously traced forthe first due arrival indicator. C" restores shortly after the sixthdigit and while relay :8 is still energized again operates magnet l25 tostep wiper 129 to its third bank contact to select the third due arrivalindicator over conductor D3 after which relay S restores. In the samemanner as just described the third and fourth due arrival indicators arestepped to display digits 2 and 0. The l due departure indicators of theselected set are stepped to display digits 0, l, 5 and in response todialling the four due departure digits 0, l, and 0. The wiper 129 ofswitch MSD' takes one step after each digit in the same manner aspreviously described. The indicators of the selected set have now beenset to display the flight number tilt, the due arrival time 1:20 and thedue departure time 1:50 cor responding to the settings on the displaypanels thereby giving the control operator a check on the displaypanels. In case the control operator dials the special on time, delayed,or cancelled digits these specified numerals would be displayed on thefirst due arrival indicator in a manner apparent from the foregoingdescription.

Release operation After completing the display on the display panels andon the operators monitor or pilot se-' lector, the control operator willrestore the key K (Fig. 2) thereby releasing relay A in the controloflice and the similar relays in the remote oiflces to cause thecontrolling apparatus to restore to normal without disturbing thedisplay set up. Relay A, upon restoring, at contacts 2% opens thecircuit to relays B and B which restore after an interval. Relay 3 atcontacts 2!! opens the locking circuits to relay RE and TI to T4 tocause their release. At contacts 2E3 relay B grounds conductor 29% tocomplete circuits to restore switches MSD, MSP, FS and MSW. The circuitfor restoring switch MSD extends from grounded conductor 294 and throughthe off normal springs 22? and the winding of release magnet 223 tobattery. Off normal springs 22? of switch MSD opens the circuit to therelease magnet when the wiper 229 is fully restored to normal. Thecircuit for the release magnet 2% of switchMSP extends through the oilnormal contacts 285 and after the magnet has restored the wiper Bill tonormal the off normal springs 2% open the circuit with its releasemagnet. The circuit to the release magnet 313 of the flight selector FSextends through ofi normal contacts 3!? and these of? normal contactsopen when the wiper shaft is fully restored to normal. The releasemagnet 382 is operated over a similar circuit for restoring the switchMSW to normal. The operated flight relays FS, SC and DD are restored tonormal in response to the above described switch release operations.Relay B at contacts 21s and 2M completes a similar circuit three onnormal contacts-21$ for operating the release magnet 2H of the codeswitch MSC to restore it to its normal position. The restoration of theflight relays FR, SC and DD are ineffective to cause a restoration ofthe operated lamp relays in the operated lamp relay groups, such as DRE,and the panel destination relays, such as relays cit-59c, because theseoperated relays are locked operated to grounded conductor 50c.

Relay B (Fig. 10), upon restoring, at contacts lid opens the lockingcircuits of relays Til to Th3 to cause their release. t contacts H3relay l3 completes circuits for restoring switch MED and MSP throughtheir off normal contests 727 and "its for operating their respectiverelease magnets 5'23 and list. The indicators remain in their setpositions because no restoring circuits are completed to cause theirrestoration. The control apparatus in all oiiices have now been restoredto normal and may now be re-operated to cause a new display on the sameor other display panels and indicator sets.

Having described the invention, what is considered to be new and isdesired to be protected by Letters Patent will be set forth in thefollowing claims:

What is claimed is:

i. In a transportation indicator system, a plurality of display panels,flight lamp groups in each panel for visually displaying digitscorresponding to any flight number, schedule lamp groups in each panelfor visually displaying digits corresponding to the scheduled time ofarrival of any flight, destination lamps in each panel for visuallyindicating destination stopping points for any flight, lamp group relaysindividual to each lamp group in each panel for controlling the lamps inits lamp group to display digits, panel relays in each panel forcontrolling said destination lamps, sets of flight relays common to allsaid panels, each set corresponding to a particular flight, means forselecting a particular one of said display panels, means operative inresponse to the dialling of the digits corresponding to a flight numberfor operating a corresponding set of flight relays, circuits completedby the operated set of flight relays for operating said lamp grouprelays in only said selected panel to control said lamp groups todisplay said flight number and the scheduled time of arrival of saidflight, and other circuits completed by said operated set of flightrelays for operating certain ones of said panel relays in only saidselected panel to light destination lamps corresponding to the stoppingpoints of said flight.

2. In a transportation indicator system for displaying the flightnumber, the scheduled time of arrival of the displayed flight number,and for indicating the stopping points of the displayed flight number ona selected display panel as claimed in claim 1 which includes furthermeans responsive to the selection of one or said panels for wiping outany previous display and indication on said selected panel.

3.111 a transportation indicator system for displaying the flightnumber, the scheduled time of arrival of the displayed flight number,and for indicating the stopping points or" the displayed flight numberon a selected display panel as claimed in claim 1 including an operatingsource of current, and means for connecting said source to only thepanel selected by said panel selecting means to complete said circuitsand said other circuits for operating the lamp 19 group relays and thepanel relays in only the said selected panel.

4. In a transportation indicator system, a plurality of display panels,flight lamp groups in each panel for visually displaying digitscorresponding to any flight number, schedule lamp groups in each panelfor visually displaying digits corresponding to the scheduled time ofarrival of any flight, lamp group relays individual to each lamp groupin each panel for controlling the lamps in its lamp group to displaydigits, sets of flight relays common to all said panels, each setcorresponding to a particular flight, contacts on said flight relays,conductors extending from said contacts to said lamp group relays in allsaid panels, a code distributing frame for code marking certain of saidconductors through operated ones of said contacts in accordance withflight numbers and in accordance with the scheduled time of arrival ofsaid flights, means for selecting a particular one of said displaypanels, means operative in response to dialling the digits of a flightnumber for operating a corresponding set of flight relays, circuitscompleted over the contacts of the operated flight relays, the codemarked conductors and said code distributing frame to the lamp grouprelays of only said selected panel to operate the lamp group relays ofonly the selected panel in accordance with said code markings, and othercircuits completed by the operated lamp group relays for causing thelamp groups of said selected panel to display said flight number and thescheduled time of arrival of said flight.

5. In a transportation indicator system, a plurality of display panels,flight lamp groups in each panel for visually displaying digitscorresponding to any flight number, schedule lamp groups in each panelfor visually displaying digits corresponding to the scheduled time ofarrival of any flight, due lamp groups in each panel for visuallydisplaying digits corresponding to the due time of arrival of anyflight, lamp group relays individual to each lamp group in each panelfor controlling the lamps in its lamp group to display digits, sets offlight relays common to all said panels, each set corresponding to aparticular flight, a source of operating current, means for selecting aparticular one of said panels by connecting said source to only saidselected panel, means responsive to the dialling of the digits corresponding to a flight number for operating a corresponding set offlight relays, circuits closed by said operated set of flight relays andcompleted to said source connected to said selected panel for operatingonly the flight lamp group relays and the schedule lamp group relays insaid selected panel, other circuits completed by the operated lamp grouprelays to cause the lamps in the flight lamp group to display the digitsof the dialled flight number and to cause the lamps in the schedule lampgroup to display digits corresponding to the scheduled time of arrivalof said flight, a code switch, conductors terminating in said codeswitch, a sequence switch, means responsive to dialling the digitscorresponding to the due arrival time of said selected flight foroperating said code switch and said sequence switch, means controlled bysaid sequence switch for successively connecting said conductors tosuccessive ones of said groups of due lamp relay groups, wipers on saidcode switch for grounding said conductors in code cominations inaccordance with the successive dialled digits of said due arrival timeto operate corresponding relays in successive due lamp relay groups overcircuits completed to said source connected to only said selected panel,and circuits connections completed by said operated due lamp relays forlighting the lamps in said due lamp groups in said selected panel todisplay the due time of arrival of said selected flight.

6. In a transportation indicator system, a display panel, a plurality oflamp sets in said panel divided into a first group, a second group, anda third group, each group containing a plurality of said sets and eachset comprising a plurality of lamps so arranged that the display of anydigit requires the illumination of a combination of said lamps tooutline such digits, a group of lamp relays individual to each said setof lamps, code marking means, means responsive to the dialling of aspecial number for selectively operating said code marking means, codedcircuits completed by the selective operation of said code marking meansfor operating certain combinations of said relays in the successivegroups of relays which are individual to said first group of lamp setsand for operating predetermined combinations of said relays in thesuccessive groups of relays which are individual to said second group oflamp sets, the said certain combinations of operated relays in the saidsuccessive relay groups corresponding to the successive dialled digitsof said special number and the said predetermined combinations ofoperated relays in the other successive groups having no correspondenceto the successive dialled digits of said special number, circuitscompleted by the said operated certain combinations of said relays forilluminating a plurality of lamps in successive sets of said first lampgroup to outline the successive digits of Said dialled special number,other circuits completed by the said operated predetermined combinationsof said relays for illuminating a plurality of lamps in successive setsof said second lamp group to outline successive digits of a numberdifferent from the digits of said dialled special number, meansresponsive to dialling the successive digits of another number forsuccessively operating other combinations of said relays in successiverelay groups which are individual to said third group of lamp sets, thesaid other combinations of relays operated being dependent upon thedigits dialled, and further circuits completed by said operated othercombinations of relays for illuminating a plurality of lamps insuccessive sets of said third lamp group to outline the successivedigits of said dialled other number.

'7. In a transportation indicator system a plurality of display panels,first, second, and third lamp groups in each panel, each groupcomprising a plurality of sets of lamps, each set containing a pluralityof lamps so arranged that the display of any digit requires theilluminating of a combination of said lamps to outline such digits, alamp relay group individual to each set of lamps, sets of code markingrelays common to said panels, each set of relays corresponding to apar.- ticular number, conductors extending from said code marking relaysto all said lamp relay groups, a source of current, means for selectingone of said panels by connecting said source to only said selectedpanel, means responsive to the dialling of a special number forselectively operating one set of code marking relays, contacts on saidoperated set of code marking relays completing circuits by groundingpredetermined ones of said conductors in code combinations to operatecorresponding relays in combinationin the lamp relay groups individualto saidfirst andsecondlamp groups in only the said selected panel havingsaid source connected thereto, circuits completed by the operatedcombination of relays in said lamp relay groups for illuminating aplurality of lamps in successive sets of said first lamp group tooutline the successive digits of said dialled number for illuminating aplurality of lamps in successive sets of said second lamp group tooutline the successive digits of a multi-di'git number, other codemarking conductors common to all said panels, code marking means, meansresponsive to dialling the successive digits of another multi-digitnumber for operating said code marl;- ing means to ground some of saidother code marking conductors in code combinations in accordance witheach digit dialled, sequence con-'- necting means controlled by saidsuccessive dialled digits of said other multi-digit number forsequentially connecting said grounded code combinations of said othercode marking conductors to successive ones of said lamp relay groupsindividual to said third lamp groups, other combinations of relays inthe successive lamp relay groups individual to said third lamp group ofonly said selected panel being operated by said connected source and bysaid grounded other code marking conductors, and other circuitscompleted by said operated other combinations of said relays forilltmiinating a plurality of lamps in successive sets of said third lampgroup to outline the successive dialled digits of said other multi-digitnumber.

8. In a transportation indicator system, a display panel, a group oflamps in said panel for vis ually displaying a time digit, a lamp relaygroup individual to said group of lamps, a due compartment lamp in saidpanel associated with said lamp group, a panel relay in said panelhaving a circuit for controlling the lighting of said due lamp, an ontime compartment lamp in said panel, means for selecting said panel andfor operating said panel relay to light said due lamp, control meansresponsive to the dialling of said time digit for operating certainrelays in said lamp relay group, circuits connecting said lamps of saidgroup with said lamp relay group completed by said operated certainrelays for lighting a plurality of lamps in said lamp group to displaysaid dialled time digit, said control means effective in case anotherdigit corresponding to said on time lamp is dialled instead of said timedigit for operating predetermined relays in said lamp relay groupinstead of said certain relays, and special circuits completed by theoperation of said predetermined relays for restoring said panel relay toextinguish said due lamp and for illuminating said on time lamp.

9. In a transportation indicator system, a display panel, a group oflamps in said panel for visually displaying a time digit, a lamp relaygroup individual to said group of lamps, a due compartment lamp in saidpanel, a panel relay in said panel having a circuit for controlling saiddue lamp, means for selecting said panel and for operating said panelrelay to light said due lamp, control means responsive to the diallingof said time digit for operating certain relays in said lamp relaygroup, circuits connecting the lamps of said group with said lamp relaygroup completed by said operated certain relays for lighting a pluralityof the lamps in said lamp group to display said dialled time digit,special lamps in said panel for designating on time, delayed andcancelled, a different special call digit assigned to" each ofsaidspecial lamps, said control means effective in case one of saidspecial call digits is dialled instead of said time digit for operatinga different predetermined combination of relays in said lamp relay groupcorresponding to said one special dialled digit instead of operatingsaid certain relays, special circuits completed by the operation of saiddifferent predetermined relay combinations for lighting said on timelamp, said delayed lamp, or said cancelled lamp dependent upon the digitdialled and the combination of relays operated, and means controlled byone of said relays in said predetermined combinations for restoring saidpanel relay to exting'uish said due lamp.

10. In a, transportation indicator system, a display panel, a set oflamps in said panel arranged so that the display of any digit requiresthe illumination of a plurality of the lamps therein in predeterminedcombinations to outline such digits, a lamp relay group individual tosaid set of lamps, an individual display lamp in said panel, means forselecting said panel and for lighting said individual lamp, controlmeans responsive to the dialling of a first digit for operating certainrelays in said group, circuits completed by said operated certain relaysto certain of said lamps in said set for illuminating said certain lampsto outline the first said digit, special lamps in said panel eachassigned a different call digit, said control means effective in caseone of said different call digits is dialled instead of said first digitfor Operating a diiierent combination of said relays in said groupdependent upon the different call digit dialled, individual circuits forilluminating the respective special lamps completed by the respectivedifferent combinations of relays operated, and means controlled by anyone of said different combinations of said relays for extinguishing saidindividual display lamp.

11. In a transportation indicator system, a plu rality of flight displaypanels arranged in pairs, each pair comprising an arrival panel and adeparture panel, flight groups in each panel for visually displayingdigits corresponding to any flight number, arrival schedule lamp groupsin each arrival panel for visually displaying digits corresponding tothe scheduled arrival time of any flight, departure schedule lamp groupsin each departure panel for visually displaying digits corresponding tothe scheduled departure time of any flight, groups of lamp group relaysindividual to said flight and schedule lamp groups, sets of flightrelays common to all said panels each set corresponding to a particularflight, a source of operating current, means for selecting a pair ofsaid panel by connecting said source to the lamp group relays of onlysaid selected pair, means responsive to dialling a multi-digit numbercorresponding to a particular flight for operating a corresponding setof flight relays, fixed coded circuits closed by said operated set offlight relays and completed to said source connected to said selectedpair of panels for operating combinations of flight lamp group relaysand combinations of schedule lamp group relays in said selected pair ofpanels, circuits completed by the operated combinations of flight lampgrou re-

